Answer: The phrase that is used by the Code of Professional Conduct to describe integrity is A. Candid, within the constraints of client confidentiality.
Step-by-step explanation: The Code of Professional Conduct consists of several principles related to good professional conduct. One of these principles is integrity, which is found in Section I, Article III and perceived as essential when performing professional responsibilities. According to this code, integrity is about being honest and candid within the constraints of client confidentiality. In other words, integrity is about about being truthful while respecting certain limits. In that way, the correct answer is A.